I’ve just finished using a CGM for 2 weeks as a paying participant in the ZOE study, which I mentioned in a previous post: healthunlocked.com/pmrgcauk...
Many PMR and GCA patients, self-included, have raised blood sugar (BS) as a side-effect of steroids and other factors. My HbA1c was around the 48-53 mark, which is the diabetes zone. Doctors have been recommending I take diabetes meds eg Gliclazide to lower them, but I’ve been reluctant to add in yet more meds and wanted more info about what actually happens in your body when you take steroids.
Conclusion (for me anyway) What you eat, when you eat and how you eat all have an effect on blood sugars when you are taking steroids.
I found that nothing much happened to my levels for the first 3 hours after taking the Pred. BS rose but only very slightly and stayed around the 6 mmol mark (normal range = 4 to10).
However, in the 3-4 hours after that, BS rose quite sharply. If I didn’t eat anything at all apart from the odd cup of tea with oat or cow milk, or had some non-carb nibbles eg some cheese, meat; my BS rose but stayed within the normal range, say 8 mmol. Levels started to fall naturally about 4 hours after that, ie about 6-7 hours after taking the Pred. If I ate anything with carbs in during this time (4-7 hours after the Pred) the BS would shoot up into the amber or red zone very quickly eg to 11-13 or more. Small things like a samosa one day, or a small pasta salad, or toasted ancient grain roll all took me over the 10 mark.
So, as I take my Pred about 9am, BS levels started to rise about 12-1pm and stay high until about 3-5pm then started to fall. If I fasted or kept very low carbs the graph would continue to fall. If I ate the same carbs as I’d tried before at lunchtime at teatime eg after about 6pm, BS still rose, but not by as much, and generally stayed within the normal zone. Adding extra carbs after a meal eg a scone or a bit of brown rice didn’t cause a double spike. In other words I was able to ‘sneak in’ extra carbs late in the day after other food.
There were a few experiments that caused BS to go beyond normal ranges. One bad spike was when I had a cheese and ham toastie with white bread from Costa about 3pm. BS shot up rapidly and stayed high for several hours. Usually the curve would have flattened faster about that time. The worst day was an afternoon tea with classic sandwiches, cake etc. BS shot up rapidly and stayed high for a few hours. There was a similar result with a picnic – the same type of food.
Info from the ZOE programme predicted that exercise done within half an hour of eating also lowers your BS, but I didn’t really get a chance to test that. Having a salad or green veg as a starter before the main course that included carbs also seemed to help but I only tried that once so can’t draw strong conclusions there.
Another strange thing was that BS levels dropped very low about an hour before waking, in the red zone below 3 mmol. I hypothesise also that steroid levels would be at their lowest around that time and inflammation the highest?
Two weeks wasn’t long enough to do all the experiments I would have liked to do but it was fascinating. At the moment GPs are only prescribing CGMs for Type 1 diabetics but if your BS levels are high and you’ve been told you’re pre-diabetic it might be worth asking. Otherwise the ZOE tests cost about £400.
So to conclude (for me anyway, everyone is different):
• Avoid eating carbs and sugars between 3 and 7 hours after taking Pred. Eating straight after taking them eg with breakfast, didn’t have much effect on BS. In my case though, having a small breakfast of 35g overnight oats, oat milk, nuts and berries made me hungrier around lunchtime, whereas when I usually skip breakfast I don’t get hungry.
• If you really must have something sweet, have it after the evening meal, not as a snack
• If you have carbs, combining them with salad or veg or protein might help lower BS, as might exercise within 20 mins of eating (these are findings from the ZOE experiments - I don’t think I could conclude that on my limited experience)
Eating one meal a day, at least 7 hours after taking Pred ie teatime seems to work best for me. It’s best not to have any carbs as it makes me hungrier and want to eat bigger potions but even then, if say I ate a bit of brown rice or pasta or wholmeal or sourdough bread, generally the BS still stayed in the normal range. For example the same pasta salad that spiked my levels one lunchtime had a much lesser effect eaten early evening.
I was surprised I didn’t lose much weight during this experiment, but then I have been eating low carbs generally for many years now. I lost a lot of weight when I reduced steroids gradually from 22.5 to 15 between March and July but it seems to have plateaued now. I still suffer from a lot of water retention which I think is another side effect of steroids, but this seemed to be helped by low-carb eating too.
Another hypothesis not tested is that the Hydroxychloroquine I take might be lowering my BS and reducing my appetite as they are two known side-effects. But I didn’t get to test that by skipping the Hydroxy. Too much to try in just 2 short weeks.
I generally had less fatigue and brain fog when I ate healthily, though this seemed to be a bit random.
I was hooked on watching the BS levels on the APP so maybe that helped keep me on track – trying to keep my BS within the normal range when I wasn’t doing experiments.
Finally, one the tests they do on Day 1 is to eat some standardised ‘muffins’ at set times. According to Zoe, my results showed a poor response to these, although my graph did stay I the normal level so I find that rating confusing. That didn’t surprise me that my blood sugar levels were affected by sugar which is why and try to avoid sweet things and carbs in the first place. You also do a fingerprick test that shows your blood fat control and mine was also rated poor, which I’m told by my rheumatologist is something they often see with people on long term steroids. Or it might just be because I’m overweight and eat too many ‘bad’ fats eg I love ham and other processed meats. The published research on cholesterol, particularly triglycerides, is very conflicting so I am not worried about that.
I have been following a low-carb lifestyle for a few years now, so low carbs, moderate/higher protein and fats. But this another controversial area, with many doctors still saying saturated fats are bad for you while others say fat is not the problem, sugar and carbs are, and that’s what I believe too. Studies have shown that eating cheese has no effect on triglycerides, yet all the general advice which is probably outdated is to avoid saturated fats. It’s hard to know what is the truth.
Would I recommend ZOE?
I have been eating low-carb and read a lot about blood sugars and the gut biome, so a lot of the info they gave me I already knew. But at the moment it’s the only way to get the Libre3 sensor, so if your GP says you’re in the diabetic or even pre-diabetic range I’d say it’s worth it alone to know how your body processes carbs and adjusting how what and when you eat.
You get a finger-prick test that shows how your body processes fats I the blood. I presume that is a triglyceride test, but it doesn’t say in the Zoe literature. Mine was on the high side, and again this is associated with people on steroids.
You also get a microbiome gut test, which is interesting, and mine was ranked ‘good’, but the science doesn’t know enough yet about how to interpret the results. For example some of the bacteria in my guts is associated with inflammation but is it cause or effect? I already knew that eating an avocado has a good impact on my gut bacteria and is much better for my body than eating a doughnut, even if the avocado is higher calories, but some people believe ‘a calorie is a calorie’. I’d recommend reading books eg by Michael Mosley and Tim Spector, as the lessons included in the ZOE App are too simplistic. For me the best thing about the experiment was to learn that I’m basically on the right track and can control blood sugars without needing diabetes meds. And that if I do want to some ‘treats’ (though I hate that word) - eg some wholewheat pasta, brown rice, potatoes or good quality bread - have them late in the day once your blood sugars have fallen, combined with or after veg and proteins, and only a small portion as an add-on, not the basis of a meal. And eat your greens. Tim Spector says to aim for 30 different plants a week, which sounds daunting but includes things like nuts, lentils and herbs.
Thoughts, comments and experiences very welcome!